#include<cstdio>
int main(){
	int n, a = 1, ans = 0;
	int left, now, right;
	scanf("%d", &n);
	while(n/a != 0){
		left = n / (a * 10);
		now = n / a % 10;
		right = n  % a;
		if(now == 0) ans += left * a;
		else if(now == 1) ans += left * a+ right + 1;
		else ans += (left + 1) * a;
		a *=10;
	}
	printf("%d\n", ans);
	return 0;
}
